About FireCalc

FireCalc is a small set of free calculators built to answer one practical question: given my savings, contributions, spending, and a return assumption, how many years until I can retire early? Every calculation runs locally in your browser — nothing is uploaded or stored.

The math uses the well-known 4% safe-withdrawal rule (your FIRE number is 25× annual spending) and the future-value-of-an-annuity formula. The figures are educational illustrations, not personalized advice.